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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Heat Transport Enhancement of Turbulent Thermal Convection by Inserted Channels
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Heat Transport Enhancement of Turbulent Thermal Convection by Inserted Channels

机译：APS-流体动力学APS分部第70届年会-事件-通过插入通道增强湍流热对流的传热

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We report an experimental study on the heat transport properties of turbulent Rayleigh Benard Convection (RBC) in a rectangular cell with two types of 3D-printed structures inserted inside. The first one splits the original rectangular cell into 60 identical sub cells whose aspect ratio is 1:1:10 (length, width, height). The second one splits the cell into 30 sub cells, each with a 1:2:10 aspect ratio and a baffle in the center. We find that for large Rayleigh numbers (Ra), the Nusselt numbers (Nu) of both structures increase compared with that of the empty rectangular cell. An enhancement in Nu as much as 20% is found for the second type of insertion at Rayleigh number $2imes10^9$. Moreover, the Nu-Ra scaling shows a transition with both geometries. The particle image velocimetry (PIV) measurement within a single sub unit indicates that the transition may be related to the laminar to turbulent transition in flow field. Direct numerical simulations (DNS) confirm the experimental results. Our results demonstrate the potential in using insertions to enhance passive heat transfer.
机译：我们报告了在矩形单元格中湍流瑞利·贝纳德对流（RBC）的热传输特性的实验研究，该矩形单元中插入了两种3D打印结构。第一个将原始矩形单元格拆分为60个相同的子单元格，其长宽比为1：1：10（长，宽，高）。第二个将单元拆分为30个子单元，每个子单元的纵横比为1：2：10，中间有一个挡板。我们发现，对于较大的瑞利数（Ra），两种结构的Nusselt数（Nu）均比空矩形单元的Nusselt数增加。第二种插入类型在瑞利数$ 2imes10 ^ 9 $处的Nu增强高达20％。此外，Nu-Ra缩放显示两种几何都有过渡。单个子单元内的粒子图像测速（PIV）测量表明，过渡可能与流场中的层流到湍流过渡有关。直接数值模拟（DNS）确认了实验结果。我们的结果证明了使用插入来增强被动传热的潜力。

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